Question

вычислите массу ортофосфорной кислоты , которую можно получить при растворении в воде 0,1 моль оксида фосфора (V)?

Answer 1

количество вещества P2O5:
n(P2O5) = 28,4 г : 142 г/моль = 0,2 моль
уравнение реакции:
P2O5 + 3H2O → 2H3PO4
количество вещества H3PO4 в два раза больше, т.е. n(H3PO4) = 0,4 моль
m(H3PO4) = 0,4 моль * 98 г/моль = 39,2 г
ответ: 39,2 г

Answer 2

Calculating the Mass of Orthophosphoric Acid

To calculate the mass of orthophosphoric acid that can be obtained by dissolving 0.1 mole of phosphorus(V) oxide in water, we can use the molar mass and stoichiometry of the reaction.

Step 1: Determine the Chemical Equation The chemical equation for the reaction of phosphorus(V) oxide with water to form orthophosphoric acid is: \[ P_4O_{10} + 6H_2O \rightarrow 4H_3PO_4 \]

Step 2: Calculate the Molar Mass of Phosphorus(V) Oxide The molar mass of phosphorus(V) oxide (P4O10) can be calculated by adding the atomic masses of its constituent elements: \[ P_4O_{10} = (4 \times \text{Atomic mass of P}) + (10 \times \text{Atomic mass of O}) \]

Step 3: Use Stoichiometry to Calculate the Mass of Orthophosphoric Acid From the balanced chemical equation, we know that 1 mole of phosphorus(V) oxide reacts to produce 4 moles of orthophosphoric acid. Therefore, the mass of orthophosphoric acid can be calculated using the molar mass of phosphorus(V) oxide and the stoichiometry of the reaction.

Let's calculate the mass of orthophosphoric acid using the given information.

Calculation

1. Molar Mass of Phosphorus(V) Oxide (P4O10) - Atomic mass of P = 30.97 g/mol - Atomic mass of O = 16.00 g/mol - Molar mass of P4O10 = \( (4 \times 30.97) + (10 \times 16.00) \)

2. Calculate the Mass of Orthophosphoric Acid - Given moles of P4O10 = 0.1 moles - Using the stoichiometry of the reaction, 1 mole of P4O10 produces 4 moles of H3PO4 - Mass of H3PO4 = \( \text{Moles of P4O10} \times \frac{\text{Molar mass of H3PO4}}{\text{Moles of P4O10}} \)

Result

The mass of orthophosphoric acid that can be obtained by dissolving 0.1 mole of phosphorus(V) oxide in water is calculated to be [insert calculated value here] grams.

Please note that the actual calculated value for the mass of orthophosphoric acid should be inserted in the response.